west.yml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  fb2cf0ec3da3687b93f28e556ab682bdd4b85223

Brings following Zephyr relevant fixes:
  - 89807992 boot: zephyr: Fix build for nrf9160dk
  - 2f5a7f47 boot: zephyr: Fix build for thingy53
  - c9e4ab8b boot: zephyr: Fix build for thingy52
  - 1d79ef35 boot: Fix ASN.1 for mbedtls >= 3.1
  - 86acda9e ext: fiat: Use user-defined assert macro
  - 9ae634f3 bootutil: Fix signed/unsigned comparison in
    boot_read_enc_key
  - 533fef2a imgtool: Update version.py to take command line
    arguments
  - 316a139c imgtool: dumpinfo improvements
  - f3a57028 imgtool: Various dumpinfo fixes
  - d16a613f imgtool: Assert "measurement value" is last in
    boot_record.py
  - 36f8bf30 imgtool: Fix verify command for edcsa-p384 signed
    images
  - 2712f743 imgtool: Add missing requirements to requirements.txt
    file
  - 45d379e7 zephyr: boards: Add files needed for NXP FRDM MCXN947
    QSPI variant
  - 3113df8f imgtool: initial sanity test
  - a4cb878c imgtool: Fixed missing dependency to 'pyyaml' (for
    dumpinfo)
  - faf2dd1f imgtool: fixed keys/general.py to pass existing
    unittests

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>